Phone numbers in Keyser, West Virginia
Keyser has 8 phone prefixes in area codes 304, 681.
Biggest holders: AT&T Mobility, UScellular, Onvoy. This is the local calling area (rate center) where those prefixes were first assigned.
- Mobile carrier 75%
- Local phone company 12%
- Internet / business phone carrier 12%
Every prefix in Keyser
Search the first six digits of a number in this list. If it's here, the number started in Keyser with the carrier shown. If it isn't, check the West Virginia page or look the number up.
| Prefix | Carrier | Type | Assigned |
|---|---|---|---|
| 304-209 | AT&T Mobility | Mobile carrier | 2007 |
| 304-597 | Onvoy | Internet / business phone carrier | 2002 |
| 304-788 | Frontier | Local phone company | – |
| 304-790 | AT&T Mobility | Mobile carrier | – |
| 304-813 | UScellular | Mobile carrier | – |
| 681-266 | T-Mobile (including Sprint) | Mobile carrier | 2019 |
| 681-379 | MetroPCS (T-Mobile) | Mobile carrier | 2021 |
| 681-620 | UScellular | Mobile carrier | 2014 |
Most prefixes are pooled: the 10,000 numbers in each are handed out in blocks of 1,000 to different carriers, and people can also take their numbers to another carrier. So the carrier shown is where the prefix started, not a guarantee about any one number. Source: NANPA central office code records, 2026-10-10.